Rapid electric fluid heater



March 30, 1948. L. A. REHARD RAPID ELECTRIC FLUID HEATER' Filed April 6', 1946 n//r fa i/r rl\ r v u rr r Fvrrr Patented Mar. 30, 1948 UNITED STATES PATENT OFFICE RAPID ELECTRIC FLUID HEATER Leonard A. Rehard, Kansas City, Mo.

Application April 6, 1946, Serial N0. 660,123

1 claim. l

My invention relates to improvements in heating units, particularly Well adapted for heating fluids for such uses as may be desired.

One of the objects of my invention is the provision of a novel heating unit of the kind described which will heat a desired uid, and is provided with novel means by which the heated uid may be withdrawn at diiierent desired temperatures.

Still another object of my invention is the provision of a novel heating unit of the kind described, which is simple, cheap, strong, durable, not likely to get out of order, and which is eilicient in its operation.

The novel features of my invention are hereinafter fully described and claimed,

In the accompanying drawings, which illustrate a preferred embodiment of my invention,

Fig. 1 is a horizontal section, on the line I-I of Fig. 2, of my improved heating unit.

Fig. 2 is a central vertical sectional View of the heating unit, some parts being shown in side elevation.

Fig. 3 is a top View of the heating unit,

Fig. 4 is a side elevation of the heating unit.

Fig. 5 is a central vertical sectional View of one of the valved tubes for withdrawing heated fluid from the unit.

Fig. 6 is a side elevation of the lower portion of one of the concentric tubes.

Similar characters of reference designate similar parts in the different views.

In the preferred embodiment of my invention, illustrated in the drawings, my improved heating unit is provided with a plurality of vertical cylindrical tubes, disposed concentrically in each other, and of like length, and respectively designated by I, 2, 3 and 4.

5 and 6 designate respectively an upper circular head and a lower circular head, said heads on their inner sides being provided with concentric grooves 1, Fig. 2, in which are respectively tightly fitted the adjacent ends of the tubes I, 2, 3 and 4.

The lower head 6 is provided with supporting legs 8, and a central vertical circular hole 9, Fig. 2.

Bolts I having nuts I I extend vertically through the heads and 6 and hold the heads tightly against the ends of the vertical tubes I, 2, 3 and 4.

The heads 5 and 6 and the tubes I, 2, 3, and 4 form concentric chambers I2, I3, I4 and I5.

A fluid discharge pipe I6 extends vertically in the chamber I5 and has its externally threaded upper end iitted in a central hole in the upper head 5, its lower end being above and spaced from 2 the hole 9 in the lower hea-d 6. A discharge pipe I'I mounted on the upper head 5 and having in it a valve or damper I8, registers with the pipe I6.

Bolts I3 having nuts 20 extend through the lower head 6 and a circular nonconducting plate 2l, preferably of asbestos, and fastens the plate 2l to the under side of the head 6. A Vertical tubular container 22, mounted on the plate 2I, extends upwardly through the hole 9 into the pipe I 6, and holds an electrical heating element 23,

The outermost tube I has near the head 6 an inlet fluid passage 24, containing a valve or damper 25,

The tube 2 has through it adjacent to the upper head 5 iluid passages 26, circularly spaced apart, and connecting the chamber I2 with the chamber I3.

The tube 3, adjacent to the lower head 6 has through it circularly spaced apart fluid passages which connect the chamber I3 with chamber The tube 4 has through it adjacent to the upper head 6 circularly spaced apart fluid passages 28, which connect the chamber I4 with the central chamber I5.

The upper head 5 is provided with threaded holes respectively registering with the chambers, I2, I3 and I4, and in which are respectively fitted the lower threaded ends of iluid discharge tubes 29, 30 and 3l, respectively provided with shut oil valves 32, Figs. 2, 3, 4 and 5.

In operation, uid to be heated, as air, is admitted through the passage 24, into the outer chamber I2, from which it passes by the passages 26 into the chamber I3, thence passing downwardly to and through the passages 2'I into the chamber I4, thence upwardly to and through the passages 28 to the central chamber I5, thence downwardly to the lower open end of the pipe I6, thence upwardly through the pipe I6, and past the heating element container 22, and out from the pipe I1, to the atmosphere, or where it is to be used.

The iluid passing from the pipe I 6 is at its maximum heat. If it is desired to get iluid somewhat cooler, fluid is drawn from the discharge pipe 3|. If iiuid of still lower temperature is desired, it is drawn from the discharge pipe 30. If yet cooler fluid is desired, it is drawn from discharge tube 29.

Thus uid of different temperatures may be drawn from the same unit at the same time.

Many modifications of my invention, within the scope of the appended claim, may be made without departing from the spirit of my invention.

What I claim is:

In a heating unit, in combination with spaced apart tubes of diierent diameters one Within the other, of two heads provided respectively on their inner sides with concentric grooves in which are respectively tightly iitted opposite ends of said tubes forming chambers concentrically in said tubes, means for fastening said heads to said tubes, a iiuid discharge pipe extending through one of said headsinto'the innermost of said tubes and spaced-from Ythe other of said heads, a'heating element supported by said other head in the innermost of said chambers, the outermost of said tubes having a uid inlet passaga-theinnerones of said tubes having respectively'through them 15 1,963,367

tiuid passages connecting adjacent chambers, vthe 5 ones of said chambers.

LEONARD A. REHARD.

REFERENCES CITED The following references are of record in the 10 fue this patent:

UNITED STATES PATENTS Numb er Name Date Y1,757,422 --Dean June 24, 1930 Ingison June 19, 1934 

